Ключевые слова: acute, agate, angle, background, black, cave, chemical, clear, cold, crisp, crystal, crystalline, crystallization, crystallography, dark, deposit, diamond, discover, discovery, earth, enigmatic, gem, geology, geomorphology, grotto, gypsum, ice, jewel, jewelry, light, limpid, macro, mine, mineral, mlynky, natural, nature, precious, quartz, rock, salt, science, shiny, silica, stone, topaz, transparent, ukraine, volcanic,